1989-1018

A mixed number is an addition of its whole and fractional parts.

19+89-1018

Add 19 and 89.

To write 19 as a fraction with a common denominator, multiply by 99.

19⋅99+89-1018

Combine 19 and 99.

19⋅99+89-1018

Combine the numerators over the common denominator.

19⋅9+89-1018

Simplify the numerator.

Multiply 19 by 9.

171+89-1018

Add 171 and 8.

1799-1018

1799-1018

1799-1018

1799-1018

A mixed number is an addition of its whole and fractional parts.

1799-(10+18)

Add 10 and 18.

To write 10 as a fraction with a common denominator, multiply by 88.

1799-(10⋅88+18)

Combine 10 and 88.

1799-(10⋅88+18)

Combine the numerators over the common denominator.

1799-10⋅8+18

Simplify the numerator.

Multiply 10 by 8.

1799-80+18

Add 80 and 1.

1799-818

1799-818

1799-818

1799-818

To write 1799 as a fraction with a common denominator, multiply by 88.

1799⋅88-818

To write -818 as a fraction with a common denominator, multiply by 99.

1799⋅88-818⋅99

Multiply 1799 and 88.

179⋅89⋅8-818⋅99

Multiply 9 by 8.

179⋅872-818⋅99

Multiply 818 and 99.

179⋅872-81⋅98⋅9

Multiply 8 by 9.

179⋅872-81⋅972

179⋅872-81⋅972

Combine the numerators over the common denominator.

179⋅8-81⋅972

Multiply 179 by 8.

1432-81⋅972

Multiply -81 by 9.

1432-72972

Subtract 729 from 1432.

70372

70372

The approximate value of 1989-1018 found by front end estimation.

1989-1018≈70372

Estimate 19 8/9-10 1/8